1 files changed, 61 insertions, 0 deletions
diff --git a/src/geom/stroke.rs b/src/geom/stroke.rs
new file mode 100644
index 00000000..eae43c24
--- /dev/null
+++ b/src/geom/stroke.rs
@@ -0,0 +1,61 @@
+use super::*;
+use crate::model::Smart;
+
+/// A stroke of a geometric shape.
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub struct Stroke {
+    /// The stroke's paint.
+    pub paint: Paint,
+    /// The stroke's thickness.
+    pub thickness: Abs,
+}
+
+impl Default for Stroke {
+    fn default() -> Self {
+        Self {
+            paint: Paint::Solid(Color::BLACK),
+            thickness: Abs::pt(1.0),
+        }
+    }
+}
+
+/// A partial stroke representation.
+///
+/// In this representation, both fields are optional so that you can pass either
+/// just a paint (`red`), just a thickness (`0.1em`) or both (`2pt + red`) where
+/// this is expected.
+#[derive(Default, Copy, Clone, Eq, PartialEq, Hash)]
+pub struct PartialStroke<T = Length> {
+    /// The stroke's paint.
+    pub paint: Smart<Paint>,
+    /// The stroke's thickness.
+    pub thickness: Smart<T>,
+}
+
+impl PartialStroke<Abs> {
+    /// Unpack the stroke, filling missing fields from the `default`.
+    pub fn unwrap_or(self, default: Stroke) -> Stroke {
+        Stroke {
+            paint: self.paint.unwrap_or(default.paint),
+            thickness: self.thickness.unwrap_or(default.thickness),
+        }
+    }
+
+    /// Unpack the stroke, filling missing fields with the default values.
+    pub fn unwrap_or_default(self) -> Stroke {
+        self.unwrap_or(Stroke::default())
+    }
+}
+
+impl<T: Debug> Debug for PartialStroke<T> {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        match (self.paint, &self.thickness) {
+            (Smart::Custom(paint), Smart::Custom(thickness)) => {
+                write!(f, "{thickness:?} + {paint:?}")
+            }
+            (Smart::Custom(paint), Smart::Auto) => paint.fmt(f),
+            (Smart::Auto, Smart::Custom(thickness)) => thickness.fmt(f),
+            (Smart::Auto, Smart::Auto) => f.pad("<stroke>"),
+        }
+    }
+}